剛用SQL語句查詢的時候發現了一個問題

CREATE SET TABLE PD_AUTO.ETL_Received_File ,NO FALLBACK ,

NO BEFORE JOURNAL,

NO AFTER JOURNAL,

CHECKSUM = DEFAULT

(

ETL_System CHAR(3) CHARACTER SET LATIN NOT CASESPECIFIC TITLE 'ETL System Name' NOT NULL,

ETL_Job VARCHAR(50) CHARACTER SET LATIN NOT CASESPECIFIC TITLE 'ETL Job Name' NOT NULL,

JobSessionID INTEGER TITLE 'Job Session ID' NOT NULL,

ReceivedFile VARCHAR(50) CHARACTER SET LATIN NOT CASESPECIFIC TITLE 'Received File Name' NOT NULL,

FileSize DECIMAL(18,0) TITLE 'File Size',

ExpectedRecord INTEGER TITLE 'Expected Record',

ArrivalTime CHAR(19) CHARACTER SET LATIN NOT CASESPECIFIC TITLE 'Arrival Time',

ReceivedTime CHAR(19) CHARACTER SET LATIN NOT CASESPECIFIC TITLE 'Received Time',

Location VARCHAR(128) CHARACTER SET LATIN NOT CASESPECIFIC,

Status CHAR(1) CHARACTER SET LATIN NOT CASESPECIFIC)

UNIQUE PRIMARY INDEX XAK1ETL_Received_File ( ETL_System ,ETL_Job ,

ReceivedFile );

ArrivalTime 為CHAR(19)類型，在用CAST函數做轉換的時候報錯

select cast(ArrivalTime as Date FORMAT 'YYYYMMDD')

from pd_auto.etl_received_file

錯誤信息為Invalid date supplied for ETL_Received_File.ArrivalTime

不知道問題的原因所在，試了好幾個寫法

select CAST(Trim(substr(ArrivalTime,1,10)))? as Date format 'YYYYMMDD')

from pd_auto.etl_received_file

這樣寫也不行，FORMAT函數沒起到作用得到的結果為2009-11-19，字符串沒有被格式化

后來換了一種寫法

select *

from pd_auto.etl_received_file

where CAST(CAST(ArrivalTime? as timestamp(0)) as Date format 'YYYYMMDD') >= Date '2009-12-01'

這樣寫沒有出現錯誤

不知道cast函數為什么就不能直接將char類型轉換為date型……

內置函數cast ... to date不支持這種格式，沒有replace內置函數，因此只能用類似自定義函數的功能。teradata僅支持基于c語言的函數，不支持teradta sql函數，因此必須用sp或在sql中搞定。

用字符串列替換'2009-1-3'即可，就是這么個邏輯，不過可以考慮把這些重復的做到一個子查詢中。

sel cast(Substr('2009-1-3',1,4) ||

case when char(substr('2009-1-3',Index('2009-1-3','-')+1,

Index(

Case

When?Position('-' In '2009-1-3') > 0

Then Substr('2009-1-3',1,Position('-' In '2009-1-3') - 1) || '*' || Substr('2009-1-3',Position('-' In '2009-1-3') + character_length('-'))

Else?'2009-1-3'

End,'-')-(Index('2009-1-3','-')+1)))=1 then '0' ||? substr('2009-1-3',Index('2009-1-3','-')+1,

Index(

Case

When?Position('-' In '2009-1-3') > 0

Then Substr('2009-1-3',1,Position('-' In '2009-1-3') - 1) || '*' || Substr('2009-1-3',Position('-' In '2009-1-3') + character_length('-'))

Else?'2009-1-3'

End,'-')-(Index('2009-1-3','-')+1))

else

substr('2009-1-3',Index('2009-1-3','-')+1,

Index(

Case

When?Position('-' In '2009-1-3') > 0

Then Substr('2009-1-3',1,Position('-' In '2009-1-3') - 1) || '*' || Substr('2009-1-3',Position('-' In '2009-1-3') + character_length('-'))

Else?'2009-1-3'

End,'-')-(Index('2009-1-3','-')+1))

end ||

case when char(substr(Case

When?Position('-' In '2009-1-3') > 0

Then Substr('2009-1-3',1,Position('-' In '2009-1-3') - 1) || '*' || Substr('2009-1-3',Position('-' In '2009-1-3') + character_length('-'))

Else?'2009-1-3'

End,Index(Case

When?Position('-' In '2009-1-3') > 0

Then Substr('2009-1-3',1,Position('-' In '2009-1-3') - 1) || '*' || Substr('2009-1-3',Position('-' In '2009-1-3') + character_length('-'))

Else?'2009-1-3'

End,'-')+1))=1 then '0' || substr(Case

When?Position('-' In '2009-1-3') > 0

Then Substr('2009-1-3',1,Position('-' In '2009-1-3') - 1) || '*' || Substr('2009-1-3',Position('-' In '2009-1-3') + character_length('-'))

Else?'2009-1-3'

End,Index(Case

When?Position('-' In '2009-1-3') > 0

Then Substr('2009-1-3',1,Position('-' In '2009-1-3') - 1) || '*' || Substr('2009-1-3',Position('-' In '2009-1-3') + character_length('-'))

Else?'2009-1-3'

End,'-')+1)

else

substr(Case

When?Position('-' In '2009-1-3') > 0

Then Substr('2009-1-3',1,Position('-' In '2009-1-3') - 1) || '*' || Substr('2009-1-3',Position('-' In '2009-1-3') + character_length('-'))

Else?'2009-1-3'

End,Index(Case

When?Position('-' In '2009-1-3') > 0

Then Substr('2009-1-3',1,Position('-' In '2009-1-3') - 1) || '*' || Substr('2009-1-3',Position('-' In '2009-1-3') + character_length('-'))

Else?'2009-1-3'

End,'-')+1)

end as date format 'yyyymmdd') char_to_date;

總結

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